1466 lines
56 KiB
Java
1466 lines
56 KiB
Java
/*
|
|
* Copyright (C) 2006 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package android.widget;
|
|
|
|
import com.android.internal.R;
|
|
|
|
import android.content.Context;
|
|
import android.content.res.TypedArray;
|
|
import android.content.res.Resources;
|
|
import android.graphics.Rect;
|
|
import android.util.AttributeSet;
|
|
import android.util.SparseArray;
|
|
import android.util.Poolable;
|
|
import android.util.Pool;
|
|
import android.util.Pools;
|
|
import android.util.PoolableManager;
|
|
import static android.util.Log.d;
|
|
import android.view.Gravity;
|
|
import android.view.View;
|
|
import android.view.ViewDebug;
|
|
import android.view.ViewGroup;
|
|
import android.view.accessibility.AccessibilityEvent;
|
|
import android.widget.RemoteViews.RemoteView;
|
|
|
|
import java.util.Comparator;
|
|
import java.util.SortedSet;
|
|
import java.util.TreeSet;
|
|
import java.util.LinkedList;
|
|
import java.util.HashSet;
|
|
import java.util.ArrayList;
|
|
|
|
/**
|
|
* A Layout where the positions of the children can be described in relation to each other or to the
|
|
* parent.
|
|
*
|
|
* <p>
|
|
* Note that you cannot have a circular dependency between the size of the RelativeLayout and the
|
|
* position of its children. For example, you cannot have a RelativeLayout whose height is set to
|
|
* {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT WRAP_CONTENT} and a child set to
|
|
* {@link #ALIGN_PARENT_BOTTOM}.
|
|
* </p>
|
|
*
|
|
* <p>See the <a href="{@docRoot}resources/tutorials/views/hello-relativelayout.html">Relative
|
|
* Layout tutorial</a>.</p>
|
|
*
|
|
* <p>
|
|
* Also see {@link android.widget.RelativeLayout.LayoutParams RelativeLayout.LayoutParams} for
|
|
* layout attributes
|
|
* </p>
|
|
*
|
|
* @attr ref android.R.styleable#RelativeLayout_gravity
|
|
* @attr ref android.R.styleable#RelativeLayout_ignoreGravity
|
|
*/
|
|
@RemoteView
|
|
public class RelativeLayout extends ViewGroup {
|
|
private static final String LOG_TAG = "RelativeLayout";
|
|
|
|
private static final boolean DEBUG_GRAPH = false;
|
|
|
|
public static final int TRUE = -1;
|
|
|
|
/**
|
|
* Rule that aligns a child's right edge with another child's left edge.
|
|
*/
|
|
public static final int LEFT_OF = 0;
|
|
/**
|
|
* Rule that aligns a child's left edge with another child's right edge.
|
|
*/
|
|
public static final int RIGHT_OF = 1;
|
|
/**
|
|
* Rule that aligns a child's bottom edge with another child's top edge.
|
|
*/
|
|
public static final int ABOVE = 2;
|
|
/**
|
|
* Rule that aligns a child's top edge with another child's bottom edge.
|
|
*/
|
|
public static final int BELOW = 3;
|
|
|
|
/**
|
|
* Rule that aligns a child's baseline with another child's baseline.
|
|
*/
|
|
public static final int ALIGN_BASELINE = 4;
|
|
/**
|
|
* Rule that aligns a child's left edge with another child's left edge.
|
|
*/
|
|
public static final int ALIGN_LEFT = 5;
|
|
/**
|
|
* Rule that aligns a child's top edge with another child's top edge.
|
|
*/
|
|
public static final int ALIGN_TOP = 6;
|
|
/**
|
|
* Rule that aligns a child's right edge with another child's right edge.
|
|
*/
|
|
public static final int ALIGN_RIGHT = 7;
|
|
/**
|
|
* Rule that aligns a child's bottom edge with another child's bottom edge.
|
|
*/
|
|
public static final int ALIGN_BOTTOM = 8;
|
|
|
|
/**
|
|
* Rule that aligns the child's left edge with its RelativeLayout
|
|
* parent's left edge.
|
|
*/
|
|
public static final int ALIGN_PARENT_LEFT = 9;
|
|
/**
|
|
* Rule that aligns the child's top edge with its RelativeLayout
|
|
* parent's top edge.
|
|
*/
|
|
public static final int ALIGN_PARENT_TOP = 10;
|
|
/**
|
|
* Rule that aligns the child's right edge with its RelativeLayout
|
|
* parent's right edge.
|
|
*/
|
|
public static final int ALIGN_PARENT_RIGHT = 11;
|
|
/**
|
|
* Rule that aligns the child's bottom edge with its RelativeLayout
|
|
* parent's bottom edge.
|
|
*/
|
|
public static final int ALIGN_PARENT_BOTTOM = 12;
|
|
|
|
/**
|
|
* Rule that centers the child with respect to the bounds of its
|
|
* RelativeLayout parent.
|
|
*/
|
|
public static final int CENTER_IN_PARENT = 13;
|
|
/**
|
|
* Rule that centers the child horizontally with respect to the
|
|
* bounds of its RelativeLayout parent.
|
|
*/
|
|
public static final int CENTER_HORIZONTAL = 14;
|
|
/**
|
|
* Rule that centers the child vertically with respect to the
|
|
* bounds of its RelativeLayout parent.
|
|
*/
|
|
public static final int CENTER_VERTICAL = 15;
|
|
|
|
private static final int VERB_COUNT = 16;
|
|
|
|
private View mBaselineView = null;
|
|
private boolean mHasBaselineAlignedChild;
|
|
|
|
private int mGravity = Gravity.LEFT | Gravity.TOP;
|
|
private final Rect mContentBounds = new Rect();
|
|
private final Rect mSelfBounds = new Rect();
|
|
private int mIgnoreGravity;
|
|
|
|
private SortedSet<View> mTopToBottomLeftToRightSet = null;
|
|
|
|
private boolean mDirtyHierarchy;
|
|
private View[] mSortedHorizontalChildren = new View[0];
|
|
private View[] mSortedVerticalChildren = new View[0];
|
|
private final DependencyGraph mGraph = new DependencyGraph();
|
|
|
|
public RelativeLayout(Context context) {
|
|
super(context);
|
|
}
|
|
|
|
public RelativeLayout(Context context, AttributeSet attrs) {
|
|
super(context, attrs);
|
|
initFromAttributes(context, attrs);
|
|
}
|
|
|
|
public RelativeLayout(Context context, AttributeSet attrs, int defStyle) {
|
|
super(context, attrs, defStyle);
|
|
initFromAttributes(context, attrs);
|
|
}
|
|
|
|
private void initFromAttributes(Context context, AttributeSet attrs) {
|
|
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RelativeLayout);
|
|
mIgnoreGravity = a.getResourceId(R.styleable.RelativeLayout_ignoreGravity, View.NO_ID);
|
|
mGravity = a.getInt(R.styleable.RelativeLayout_gravity, mGravity);
|
|
a.recycle();
|
|
}
|
|
|
|
/**
|
|
* Defines which View is ignored when the gravity is applied. This setting has no
|
|
* effect if the gravity is <code>Gravity.LEFT | Gravity.TOP</code>.
|
|
*
|
|
* @param viewId The id of the View to be ignored by gravity, or 0 if no View
|
|
* should be ignored.
|
|
*
|
|
* @see #setGravity(int)
|
|
*
|
|
* @attr ref android.R.styleable#RelativeLayout_ignoreGravity
|
|
*/
|
|
@android.view.RemotableViewMethod
|
|
public void setIgnoreGravity(int viewId) {
|
|
mIgnoreGravity = viewId;
|
|
}
|
|
|
|
/**
|
|
* Describes how the child views are positioned. Defaults to
|
|
* <code>Gravity.LEFT | Gravity.TOP</code>.
|
|
*
|
|
* @param gravity See {@link android.view.Gravity}
|
|
*
|
|
* @see #setHorizontalGravity(int)
|
|
* @see #setVerticalGravity(int)
|
|
*
|
|
* @attr ref android.R.styleable#RelativeLayout_gravity
|
|
*/
|
|
@android.view.RemotableViewMethod
|
|
public void setGravity(int gravity) {
|
|
if (mGravity != gravity) {
|
|
if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == 0) {
|
|
gravity |= Gravity.LEFT;
|
|
}
|
|
|
|
if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
|
|
gravity |= Gravity.TOP;
|
|
}
|
|
|
|
mGravity = gravity;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@android.view.RemotableViewMethod
|
|
public void setHorizontalGravity(int horizontalGravity) {
|
|
final int gravity = horizontalGravity & Gravity.HORIZONTAL_GRAVITY_MASK;
|
|
if ((mGravity & Gravity.HORIZONTAL_GRAVITY_MASK) != gravity) {
|
|
mGravity = (mGravity & ~Gravity.HORIZONTAL_GRAVITY_MASK) | gravity;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@android.view.RemotableViewMethod
|
|
public void setVerticalGravity(int verticalGravity) {
|
|
final int gravity = verticalGravity & Gravity.VERTICAL_GRAVITY_MASK;
|
|
if ((mGravity & Gravity.VERTICAL_GRAVITY_MASK) != gravity) {
|
|
mGravity = (mGravity & ~Gravity.VERTICAL_GRAVITY_MASK) | gravity;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public int getBaseline() {
|
|
return mBaselineView != null ? mBaselineView.getBaseline() : super.getBaseline();
|
|
}
|
|
|
|
@Override
|
|
public void requestLayout() {
|
|
super.requestLayout();
|
|
mDirtyHierarchy = true;
|
|
}
|
|
|
|
private void sortChildren() {
|
|
int count = getChildCount();
|
|
if (mSortedVerticalChildren.length != count) mSortedVerticalChildren = new View[count];
|
|
if (mSortedHorizontalChildren.length != count) mSortedHorizontalChildren = new View[count];
|
|
|
|
final DependencyGraph graph = mGraph;
|
|
graph.clear();
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
final View child = getChildAt(i);
|
|
graph.add(child);
|
|
}
|
|
|
|
if (DEBUG_GRAPH) {
|
|
d(LOG_TAG, "=== Sorted vertical children");
|
|
graph.log(getResources(), ABOVE, BELOW, ALIGN_BASELINE, ALIGN_TOP, ALIGN_BOTTOM);
|
|
d(LOG_TAG, "=== Sorted horizontal children");
|
|
graph.log(getResources(), LEFT_OF, RIGHT_OF, ALIGN_LEFT, ALIGN_RIGHT);
|
|
}
|
|
|
|
graph.getSortedViews(mSortedVerticalChildren, ABOVE, BELOW, ALIGN_BASELINE,
|
|
ALIGN_TOP, ALIGN_BOTTOM);
|
|
graph.getSortedViews(mSortedHorizontalChildren, LEFT_OF, RIGHT_OF, ALIGN_LEFT, ALIGN_RIGHT);
|
|
|
|
if (DEBUG_GRAPH) {
|
|
d(LOG_TAG, "=== Ordered list of vertical children");
|
|
for (View view : mSortedVerticalChildren) {
|
|
DependencyGraph.printViewId(getResources(), view);
|
|
}
|
|
d(LOG_TAG, "=== Ordered list of horizontal children");
|
|
for (View view : mSortedHorizontalChildren) {
|
|
DependencyGraph.printViewId(getResources(), view);
|
|
}
|
|
}
|
|
}
|
|
|
|
// TODO: we need to find another way to implement RelativeLayout
|
|
// This implementation cannot handle every case
|
|
@Override
|
|
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
|
|
if (mDirtyHierarchy) {
|
|
mDirtyHierarchy = false;
|
|
sortChildren();
|
|
}
|
|
|
|
int myWidth = -1;
|
|
int myHeight = -1;
|
|
|
|
int width = 0;
|
|
int height = 0;
|
|
|
|
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
|
|
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
|
|
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
|
|
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
|
|
|
|
// Record our dimensions if they are known;
|
|
if (widthMode != MeasureSpec.UNSPECIFIED) {
|
|
myWidth = widthSize;
|
|
}
|
|
|
|
if (heightMode != MeasureSpec.UNSPECIFIED) {
|
|
myHeight = heightSize;
|
|
}
|
|
|
|
if (widthMode == MeasureSpec.EXACTLY) {
|
|
width = myWidth;
|
|
}
|
|
|
|
if (heightMode == MeasureSpec.EXACTLY) {
|
|
height = myHeight;
|
|
}
|
|
|
|
mHasBaselineAlignedChild = false;
|
|
|
|
View ignore = null;
|
|
int gravity = mGravity & Gravity.HORIZONTAL_GRAVITY_MASK;
|
|
final boolean horizontalGravity = gravity != Gravity.LEFT && gravity != 0;
|
|
gravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
|
|
final boolean verticalGravity = gravity != Gravity.TOP && gravity != 0;
|
|
|
|
int left = Integer.MAX_VALUE;
|
|
int top = Integer.MAX_VALUE;
|
|
int right = Integer.MIN_VALUE;
|
|
int bottom = Integer.MIN_VALUE;
|
|
|
|
boolean offsetHorizontalAxis = false;
|
|
boolean offsetVerticalAxis = false;
|
|
|
|
if ((horizontalGravity || verticalGravity) && mIgnoreGravity != View.NO_ID) {
|
|
ignore = findViewById(mIgnoreGravity);
|
|
}
|
|
|
|
final boolean isWrapContentWidth = widthMode != MeasureSpec.EXACTLY;
|
|
final boolean isWrapContentHeight = heightMode != MeasureSpec.EXACTLY;
|
|
|
|
View[] views = mSortedHorizontalChildren;
|
|
int count = views.length;
|
|
for (int i = 0; i < count; i++) {
|
|
View child = views[i];
|
|
if (child.getVisibility() != GONE) {
|
|
LayoutParams params = (LayoutParams) child.getLayoutParams();
|
|
|
|
applyHorizontalSizeRules(params, myWidth);
|
|
measureChildHorizontal(child, params, myWidth, myHeight);
|
|
if (positionChildHorizontal(child, params, myWidth, isWrapContentWidth)) {
|
|
offsetHorizontalAxis = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
views = mSortedVerticalChildren;
|
|
count = views.length;
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
View child = views[i];
|
|
if (child.getVisibility() != GONE) {
|
|
LayoutParams params = (LayoutParams) child.getLayoutParams();
|
|
|
|
applyVerticalSizeRules(params, myHeight);
|
|
measureChild(child, params, myWidth, myHeight);
|
|
if (positionChildVertical(child, params, myHeight, isWrapContentHeight)) {
|
|
offsetVerticalAxis = true;
|
|
}
|
|
|
|
if (isWrapContentWidth) {
|
|
width = Math.max(width, params.mRight);
|
|
}
|
|
|
|
if (isWrapContentHeight) {
|
|
height = Math.max(height, params.mBottom);
|
|
}
|
|
|
|
if (child != ignore || verticalGravity) {
|
|
left = Math.min(left, params.mLeft - params.leftMargin);
|
|
top = Math.min(top, params.mTop - params.topMargin);
|
|
}
|
|
|
|
if (child != ignore || horizontalGravity) {
|
|
right = Math.max(right, params.mRight + params.rightMargin);
|
|
bottom = Math.max(bottom, params.mBottom + params.bottomMargin);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (mHasBaselineAlignedChild) {
|
|
for (int i = 0; i < count; i++) {
|
|
View child = getChildAt(i);
|
|
if (child.getVisibility() != GONE) {
|
|
LayoutParams params = (LayoutParams) child.getLayoutParams();
|
|
alignBaseline(child, params);
|
|
|
|
if (child != ignore || verticalGravity) {
|
|
left = Math.min(left, params.mLeft - params.leftMargin);
|
|
top = Math.min(top, params.mTop - params.topMargin);
|
|
}
|
|
|
|
if (child != ignore || horizontalGravity) {
|
|
right = Math.max(right, params.mRight + params.rightMargin);
|
|
bottom = Math.max(bottom, params.mBottom + params.bottomMargin);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (isWrapContentWidth) {
|
|
// Width already has left padding in it since it was calculated by looking at
|
|
// the right of each child view
|
|
width += mPaddingRight;
|
|
|
|
if (mLayoutParams.width >= 0) {
|
|
width = Math.max(width, mLayoutParams.width);
|
|
}
|
|
|
|
width = Math.max(width, getSuggestedMinimumWidth());
|
|
width = resolveSize(width, widthMeasureSpec);
|
|
|
|
if (offsetHorizontalAxis) {
|
|
for (int i = 0; i < count; i++) {
|
|
View child = getChildAt(i);
|
|
if (child.getVisibility() != GONE) {
|
|
LayoutParams params = (LayoutParams) child.getLayoutParams();
|
|
final int[] rules = params.getRules();
|
|
if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_HORIZONTAL] != 0) {
|
|
centerHorizontal(child, params, width);
|
|
} else if (rules[ALIGN_PARENT_RIGHT] != 0) {
|
|
final int childWidth = child.getMeasuredWidth();
|
|
params.mLeft = width - mPaddingRight - childWidth;
|
|
params.mRight = params.mLeft + childWidth;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (isWrapContentHeight) {
|
|
// Height already has top padding in it since it was calculated by looking at
|
|
// the bottom of each child view
|
|
height += mPaddingBottom;
|
|
|
|
if (mLayoutParams.height >= 0) {
|
|
height = Math.max(height, mLayoutParams.height);
|
|
}
|
|
|
|
height = Math.max(height, getSuggestedMinimumHeight());
|
|
height = resolveSize(height, heightMeasureSpec);
|
|
|
|
if (offsetVerticalAxis) {
|
|
for (int i = 0; i < count; i++) {
|
|
View child = getChildAt(i);
|
|
if (child.getVisibility() != GONE) {
|
|
LayoutParams params = (LayoutParams) child.getLayoutParams();
|
|
final int[] rules = params.getRules();
|
|
if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_VERTICAL] != 0) {
|
|
centerVertical(child, params, height);
|
|
} else if (rules[ALIGN_PARENT_BOTTOM] != 0) {
|
|
final int childHeight = child.getMeasuredHeight();
|
|
params.mTop = height - mPaddingBottom - childHeight;
|
|
params.mBottom = params.mTop + childHeight;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (horizontalGravity || verticalGravity) {
|
|
final Rect selfBounds = mSelfBounds;
|
|
selfBounds.set(mPaddingLeft, mPaddingTop, width - mPaddingRight,
|
|
height - mPaddingBottom);
|
|
|
|
final Rect contentBounds = mContentBounds;
|
|
Gravity.apply(mGravity, right - left, bottom - top, selfBounds, contentBounds);
|
|
|
|
final int horizontalOffset = contentBounds.left - left;
|
|
final int verticalOffset = contentBounds.top - top;
|
|
if (horizontalOffset != 0 || verticalOffset != 0) {
|
|
for (int i = 0; i < count; i++) {
|
|
View child = getChildAt(i);
|
|
if (child.getVisibility() != GONE && child != ignore) {
|
|
LayoutParams params = (LayoutParams) child.getLayoutParams();
|
|
if (horizontalGravity) {
|
|
params.mLeft += horizontalOffset;
|
|
params.mRight += horizontalOffset;
|
|
}
|
|
if (verticalGravity) {
|
|
params.mTop += verticalOffset;
|
|
params.mBottom += verticalOffset;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
setMeasuredDimension(width, height);
|
|
}
|
|
|
|
private void alignBaseline(View child, LayoutParams params) {
|
|
int[] rules = params.getRules();
|
|
int anchorBaseline = getRelatedViewBaseline(rules, ALIGN_BASELINE);
|
|
|
|
if (anchorBaseline != -1) {
|
|
LayoutParams anchorParams = getRelatedViewParams(rules, ALIGN_BASELINE);
|
|
if (anchorParams != null) {
|
|
int offset = anchorParams.mTop + anchorBaseline;
|
|
int baseline = child.getBaseline();
|
|
if (baseline != -1) {
|
|
offset -= baseline;
|
|
}
|
|
int height = params.mBottom - params.mTop;
|
|
params.mTop = offset;
|
|
params.mBottom = params.mTop + height;
|
|
}
|
|
}
|
|
|
|
if (mBaselineView == null) {
|
|
mBaselineView = child;
|
|
} else {
|
|
LayoutParams lp = (LayoutParams) mBaselineView.getLayoutParams();
|
|
if (params.mTop < lp.mTop || (params.mTop == lp.mTop && params.mLeft < lp.mLeft)) {
|
|
mBaselineView = child;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Measure a child. The child should have left, top, right and bottom information
|
|
* stored in its LayoutParams. If any of these values is -1 it means that the view
|
|
* can extend up to the corresponding edge.
|
|
*
|
|
* @param child Child to measure
|
|
* @param params LayoutParams associated with child
|
|
* @param myWidth Width of the the RelativeLayout
|
|
* @param myHeight Height of the RelativeLayout
|
|
*/
|
|
private void measureChild(View child, LayoutParams params, int myWidth, int myHeight) {
|
|
int childWidthMeasureSpec = getChildMeasureSpec(params.mLeft,
|
|
params.mRight, params.width,
|
|
params.leftMargin, params.rightMargin,
|
|
mPaddingLeft, mPaddingRight,
|
|
myWidth);
|
|
int childHeightMeasureSpec = getChildMeasureSpec(params.mTop,
|
|
params.mBottom, params.height,
|
|
params.topMargin, params.bottomMargin,
|
|
mPaddingTop, mPaddingBottom,
|
|
myHeight);
|
|
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
|
|
}
|
|
|
|
private void measureChildHorizontal(View child, LayoutParams params, int myWidth, int myHeight) {
|
|
int childWidthMeasureSpec = getChildMeasureSpec(params.mLeft,
|
|
params.mRight, params.width,
|
|
params.leftMargin, params.rightMargin,
|
|
mPaddingLeft, mPaddingRight,
|
|
myWidth);
|
|
int childHeightMeasureSpec;
|
|
if (params.width == LayoutParams.MATCH_PARENT) {
|
|
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(myHeight, MeasureSpec.EXACTLY);
|
|
} else {
|
|
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(myHeight, MeasureSpec.AT_MOST);
|
|
}
|
|
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
|
|
}
|
|
|
|
/**
|
|
* Get a measure spec that accounts for all of the constraints on this view.
|
|
* This includes size contstraints imposed by the RelativeLayout as well as
|
|
* the View's desired dimension.
|
|
*
|
|
* @param childStart The left or top field of the child's layout params
|
|
* @param childEnd The right or bottom field of the child's layout params
|
|
* @param childSize The child's desired size (the width or height field of
|
|
* the child's layout params)
|
|
* @param startMargin The left or top margin
|
|
* @param endMargin The right or bottom margin
|
|
* @param startPadding mPaddingLeft or mPaddingTop
|
|
* @param endPadding mPaddingRight or mPaddingBottom
|
|
* @param mySize The width or height of this view (the RelativeLayout)
|
|
* @return MeasureSpec for the child
|
|
*/
|
|
private int getChildMeasureSpec(int childStart, int childEnd,
|
|
int childSize, int startMargin, int endMargin, int startPadding,
|
|
int endPadding, int mySize) {
|
|
int childSpecMode = 0;
|
|
int childSpecSize = 0;
|
|
|
|
// Figure out start and end bounds.
|
|
int tempStart = childStart;
|
|
int tempEnd = childEnd;
|
|
|
|
// If the view did not express a layout constraint for an edge, use
|
|
// view's margins and our padding
|
|
if (tempStart < 0) {
|
|
tempStart = startPadding + startMargin;
|
|
}
|
|
if (tempEnd < 0) {
|
|
tempEnd = mySize - endPadding - endMargin;
|
|
}
|
|
|
|
// Figure out maximum size available to this view
|
|
int maxAvailable = tempEnd - tempStart;
|
|
|
|
if (childStart >= 0 && childEnd >= 0) {
|
|
// Constraints fixed both edges, so child must be an exact size
|
|
childSpecMode = MeasureSpec.EXACTLY;
|
|
childSpecSize = maxAvailable;
|
|
} else {
|
|
if (childSize >= 0) {
|
|
// Child wanted an exact size. Give as much as possible
|
|
childSpecMode = MeasureSpec.EXACTLY;
|
|
|
|
if (maxAvailable >= 0) {
|
|
// We have a maxmum size in this dimension.
|
|
childSpecSize = Math.min(maxAvailable, childSize);
|
|
} else {
|
|
// We can grow in this dimension.
|
|
childSpecSize = childSize;
|
|
}
|
|
} else if (childSize == LayoutParams.MATCH_PARENT) {
|
|
// Child wanted to be as big as possible. Give all availble
|
|
// space
|
|
childSpecMode = MeasureSpec.EXACTLY;
|
|
childSpecSize = maxAvailable;
|
|
} else if (childSize == LayoutParams.WRAP_CONTENT) {
|
|
// Child wants to wrap content. Use AT_MOST
|
|
// to communicate available space if we know
|
|
// our max size
|
|
if (maxAvailable >= 0) {
|
|
// We have a maxmum size in this dimension.
|
|
childSpecMode = MeasureSpec.AT_MOST;
|
|
childSpecSize = maxAvailable;
|
|
} else {
|
|
// We can grow in this dimension. Child can be as big as it
|
|
// wants
|
|
childSpecMode = MeasureSpec.UNSPECIFIED;
|
|
childSpecSize = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return MeasureSpec.makeMeasureSpec(childSpecSize, childSpecMode);
|
|
}
|
|
|
|
private boolean positionChildHorizontal(View child, LayoutParams params, int myWidth,
|
|
boolean wrapContent) {
|
|
|
|
int[] rules = params.getRules();
|
|
|
|
if (params.mLeft < 0 && params.mRight >= 0) {
|
|
// Right is fixed, but left varies
|
|
params.mLeft = params.mRight - child.getMeasuredWidth();
|
|
} else if (params.mLeft >= 0 && params.mRight < 0) {
|
|
// Left is fixed, but right varies
|
|
params.mRight = params.mLeft + child.getMeasuredWidth();
|
|
} else if (params.mLeft < 0 && params.mRight < 0) {
|
|
// Both left and right vary
|
|
if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_HORIZONTAL] != 0) {
|
|
if (!wrapContent) {
|
|
centerHorizontal(child, params, myWidth);
|
|
} else {
|
|
params.mLeft = mPaddingLeft + params.leftMargin;
|
|
params.mRight = params.mLeft + child.getMeasuredWidth();
|
|
}
|
|
return true;
|
|
} else {
|
|
params.mLeft = mPaddingLeft + params.leftMargin;
|
|
params.mRight = params.mLeft + child.getMeasuredWidth();
|
|
}
|
|
}
|
|
return rules[ALIGN_PARENT_RIGHT] != 0;
|
|
}
|
|
|
|
private boolean positionChildVertical(View child, LayoutParams params, int myHeight,
|
|
boolean wrapContent) {
|
|
|
|
int[] rules = params.getRules();
|
|
|
|
if (params.mTop < 0 && params.mBottom >= 0) {
|
|
// Bottom is fixed, but top varies
|
|
params.mTop = params.mBottom - child.getMeasuredHeight();
|
|
} else if (params.mTop >= 0 && params.mBottom < 0) {
|
|
// Top is fixed, but bottom varies
|
|
params.mBottom = params.mTop + child.getMeasuredHeight();
|
|
} else if (params.mTop < 0 && params.mBottom < 0) {
|
|
// Both top and bottom vary
|
|
if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_VERTICAL] != 0) {
|
|
if (!wrapContent) {
|
|
centerVertical(child, params, myHeight);
|
|
} else {
|
|
params.mTop = mPaddingTop + params.topMargin;
|
|
params.mBottom = params.mTop + child.getMeasuredHeight();
|
|
}
|
|
return true;
|
|
} else {
|
|
params.mTop = mPaddingTop + params.topMargin;
|
|
params.mBottom = params.mTop + child.getMeasuredHeight();
|
|
}
|
|
}
|
|
return rules[ALIGN_PARENT_BOTTOM] != 0;
|
|
}
|
|
|
|
private void applyHorizontalSizeRules(LayoutParams childParams, int myWidth) {
|
|
int[] rules = childParams.getRules();
|
|
RelativeLayout.LayoutParams anchorParams;
|
|
|
|
// -1 indicated a "soft requirement" in that direction. For example:
|
|
// left=10, right=-1 means the view must start at 10, but can go as far as it wants to the right
|
|
// left =-1, right=10 means the view must end at 10, but can go as far as it wants to the left
|
|
// left=10, right=20 means the left and right ends are both fixed
|
|
childParams.mLeft = -1;
|
|
childParams.mRight = -1;
|
|
|
|
anchorParams = getRelatedViewParams(rules, LEFT_OF);
|
|
if (anchorParams != null) {
|
|
childParams.mRight = anchorParams.mLeft - (anchorParams.leftMargin +
|
|
childParams.rightMargin);
|
|
} else if (childParams.alignWithParent && rules[LEFT_OF] != 0) {
|
|
if (myWidth >= 0) {
|
|
childParams.mRight = myWidth - mPaddingRight - childParams.rightMargin;
|
|
} else {
|
|
// FIXME uh oh...
|
|
}
|
|
}
|
|
|
|
anchorParams = getRelatedViewParams(rules, RIGHT_OF);
|
|
if (anchorParams != null) {
|
|
childParams.mLeft = anchorParams.mRight + (anchorParams.rightMargin +
|
|
childParams.leftMargin);
|
|
} else if (childParams.alignWithParent && rules[RIGHT_OF] != 0) {
|
|
childParams.mLeft = mPaddingLeft + childParams.leftMargin;
|
|
}
|
|
|
|
anchorParams = getRelatedViewParams(rules, ALIGN_LEFT);
|
|
if (anchorParams != null) {
|
|
childParams.mLeft = anchorParams.mLeft + childParams.leftMargin;
|
|
} else if (childParams.alignWithParent && rules[ALIGN_LEFT] != 0) {
|
|
childParams.mLeft = mPaddingLeft + childParams.leftMargin;
|
|
}
|
|
|
|
anchorParams = getRelatedViewParams(rules, ALIGN_RIGHT);
|
|
if (anchorParams != null) {
|
|
childParams.mRight = anchorParams.mRight - childParams.rightMargin;
|
|
} else if (childParams.alignWithParent && rules[ALIGN_RIGHT] != 0) {
|
|
if (myWidth >= 0) {
|
|
childParams.mRight = myWidth - mPaddingRight - childParams.rightMargin;
|
|
} else {
|
|
// FIXME uh oh...
|
|
}
|
|
}
|
|
|
|
if (0 != rules[ALIGN_PARENT_LEFT]) {
|
|
childParams.mLeft = mPaddingLeft + childParams.leftMargin;
|
|
}
|
|
|
|
if (0 != rules[ALIGN_PARENT_RIGHT]) {
|
|
if (myWidth >= 0) {
|
|
childParams.mRight = myWidth - mPaddingRight - childParams.rightMargin;
|
|
} else {
|
|
// FIXME uh oh...
|
|
}
|
|
}
|
|
}
|
|
|
|
private void applyVerticalSizeRules(LayoutParams childParams, int myHeight) {
|
|
int[] rules = childParams.getRules();
|
|
RelativeLayout.LayoutParams anchorParams;
|
|
|
|
childParams.mTop = -1;
|
|
childParams.mBottom = -1;
|
|
|
|
anchorParams = getRelatedViewParams(rules, ABOVE);
|
|
if (anchorParams != null) {
|
|
childParams.mBottom = anchorParams.mTop - (anchorParams.topMargin +
|
|
childParams.bottomMargin);
|
|
} else if (childParams.alignWithParent && rules[ABOVE] != 0) {
|
|
if (myHeight >= 0) {
|
|
childParams.mBottom = myHeight - mPaddingBottom - childParams.bottomMargin;
|
|
} else {
|
|
// FIXME uh oh...
|
|
}
|
|
}
|
|
|
|
anchorParams = getRelatedViewParams(rules, BELOW);
|
|
if (anchorParams != null) {
|
|
childParams.mTop = anchorParams.mBottom + (anchorParams.bottomMargin +
|
|
childParams.topMargin);
|
|
} else if (childParams.alignWithParent && rules[BELOW] != 0) {
|
|
childParams.mTop = mPaddingTop + childParams.topMargin;
|
|
}
|
|
|
|
anchorParams = getRelatedViewParams(rules, ALIGN_TOP);
|
|
if (anchorParams != null) {
|
|
childParams.mTop = anchorParams.mTop + childParams.topMargin;
|
|
} else if (childParams.alignWithParent && rules[ALIGN_TOP] != 0) {
|
|
childParams.mTop = mPaddingTop + childParams.topMargin;
|
|
}
|
|
|
|
anchorParams = getRelatedViewParams(rules, ALIGN_BOTTOM);
|
|
if (anchorParams != null) {
|
|
childParams.mBottom = anchorParams.mBottom - childParams.bottomMargin;
|
|
} else if (childParams.alignWithParent && rules[ALIGN_BOTTOM] != 0) {
|
|
if (myHeight >= 0) {
|
|
childParams.mBottom = myHeight - mPaddingBottom - childParams.bottomMargin;
|
|
} else {
|
|
// FIXME uh oh...
|
|
}
|
|
}
|
|
|
|
if (0 != rules[ALIGN_PARENT_TOP]) {
|
|
childParams.mTop = mPaddingTop + childParams.topMargin;
|
|
}
|
|
|
|
if (0 != rules[ALIGN_PARENT_BOTTOM]) {
|
|
if (myHeight >= 0) {
|
|
childParams.mBottom = myHeight - mPaddingBottom - childParams.bottomMargin;
|
|
} else {
|
|
// FIXME uh oh...
|
|
}
|
|
}
|
|
|
|
if (rules[ALIGN_BASELINE] != 0) {
|
|
mHasBaselineAlignedChild = true;
|
|
}
|
|
}
|
|
|
|
private View getRelatedView(int[] rules, int relation) {
|
|
int id = rules[relation];
|
|
if (id != 0) {
|
|
DependencyGraph.Node node = mGraph.mKeyNodes.get(id);
|
|
if (node == null) return null;
|
|
View v = node.view;
|
|
|
|
// Find the first non-GONE view up the chain
|
|
while (v.getVisibility() == View.GONE) {
|
|
rules = ((LayoutParams) v.getLayoutParams()).getRules();
|
|
node = mGraph.mKeyNodes.get((rules[relation]));
|
|
if (node == null) return null;
|
|
v = node.view;
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
private LayoutParams getRelatedViewParams(int[] rules, int relation) {
|
|
View v = getRelatedView(rules, relation);
|
|
if (v != null) {
|
|
ViewGroup.LayoutParams params = v.getLayoutParams();
|
|
if (params instanceof LayoutParams) {
|
|
return (LayoutParams) v.getLayoutParams();
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
private int getRelatedViewBaseline(int[] rules, int relation) {
|
|
View v = getRelatedView(rules, relation);
|
|
if (v != null) {
|
|
return v.getBaseline();
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
private void centerHorizontal(View child, LayoutParams params, int myWidth) {
|
|
int childWidth = child.getMeasuredWidth();
|
|
int left = (myWidth - childWidth) / 2;
|
|
|
|
params.mLeft = left;
|
|
params.mRight = left + childWidth;
|
|
}
|
|
|
|
private void centerVertical(View child, LayoutParams params, int myHeight) {
|
|
int childHeight = child.getMeasuredHeight();
|
|
int top = (myHeight - childHeight) / 2;
|
|
|
|
params.mTop = top;
|
|
params.mBottom = top + childHeight;
|
|
}
|
|
|
|
@Override
|
|
protected void onLayout(boolean changed, int l, int t, int r, int b) {
|
|
// The layout has actually already been performed and the positions
|
|
// cached. Apply the cached values to the children.
|
|
int count = getChildCount();
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
View child = getChildAt(i);
|
|
if (child.getVisibility() != GONE) {
|
|
RelativeLayout.LayoutParams st =
|
|
(RelativeLayout.LayoutParams) child.getLayoutParams();
|
|
child.layout(st.mLeft, st.mTop, st.mRight, st.mBottom);
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public LayoutParams generateLayoutParams(AttributeSet attrs) {
|
|
return new RelativeLayout.LayoutParams(getContext(), attrs);
|
|
}
|
|
|
|
/**
|
|
* Returns a set of layout parameters with a width of
|
|
* {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT},
|
|
* a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} and no spanning.
|
|
*/
|
|
@Override
|
|
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
|
|
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
|
|
}
|
|
|
|
// Override to allow type-checking of LayoutParams.
|
|
@Override
|
|
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
|
|
return p instanceof RelativeLayout.LayoutParams;
|
|
}
|
|
|
|
@Override
|
|
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
|
|
return new LayoutParams(p);
|
|
}
|
|
|
|
@Override
|
|
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
|
|
if (mTopToBottomLeftToRightSet == null) {
|
|
mTopToBottomLeftToRightSet = new TreeSet<View>(new TopToBottomLeftToRightComparator());
|
|
}
|
|
|
|
// sort children top-to-bottom and left-to-right
|
|
for (int i = 0, count = getChildCount(); i < count; i++) {
|
|
mTopToBottomLeftToRightSet.add(getChildAt(i));
|
|
}
|
|
|
|
for (View view : mTopToBottomLeftToRightSet) {
|
|
if (view.dispatchPopulateAccessibilityEvent(event)) {
|
|
mTopToBottomLeftToRightSet.clear();
|
|
return true;
|
|
}
|
|
}
|
|
|
|
mTopToBottomLeftToRightSet.clear();
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Compares two views in left-to-right and top-to-bottom fashion.
|
|
*/
|
|
private class TopToBottomLeftToRightComparator implements Comparator<View> {
|
|
public int compare(View first, View second) {
|
|
// top - bottom
|
|
int topDifference = first.getTop() - second.getTop();
|
|
if (topDifference != 0) {
|
|
return topDifference;
|
|
}
|
|
// left - right
|
|
int leftDifference = first.getLeft() - second.getLeft();
|
|
if (leftDifference != 0) {
|
|
return leftDifference;
|
|
}
|
|
// break tie by height
|
|
int heightDiference = first.getHeight() - second.getHeight();
|
|
if (heightDiference != 0) {
|
|
return heightDiference;
|
|
}
|
|
// break tie by width
|
|
int widthDiference = first.getWidth() - second.getWidth();
|
|
if (widthDiference != 0) {
|
|
return widthDiference;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Per-child layout information associated with RelativeLayout.
|
|
*
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignWithParentIfMissing
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_toLeftOf
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_toRightOf
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_above
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_below
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignBaseline
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignLeft
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignTop
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignRight
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignBottom
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentLeft
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentTop
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentRight
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentBottom
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_centerInParent
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_centerHorizontal
|
|
* @attr ref android.R.styleable#RelativeLayout_Layout_layout_centerVertical
|
|
*/
|
|
public static class LayoutParams extends ViewGroup.MarginLayoutParams {
|
|
@ViewDebug.ExportedProperty(category = "layout", resolveId = true, indexMapping = {
|
|
@ViewDebug.IntToString(from = ABOVE, to = "above"),
|
|
@ViewDebug.IntToString(from = ALIGN_BASELINE, to = "alignBaseline"),
|
|
@ViewDebug.IntToString(from = ALIGN_BOTTOM, to = "alignBottom"),
|
|
@ViewDebug.IntToString(from = ALIGN_LEFT, to = "alignLeft"),
|
|
@ViewDebug.IntToString(from = ALIGN_PARENT_BOTTOM, to = "alignParentBottom"),
|
|
@ViewDebug.IntToString(from = ALIGN_PARENT_LEFT, to = "alignParentLeft"),
|
|
@ViewDebug.IntToString(from = ALIGN_PARENT_RIGHT, to = "alignParentRight"),
|
|
@ViewDebug.IntToString(from = ALIGN_PARENT_TOP, to = "alignParentTop"),
|
|
@ViewDebug.IntToString(from = ALIGN_RIGHT, to = "alignRight"),
|
|
@ViewDebug.IntToString(from = ALIGN_TOP, to = "alignTop"),
|
|
@ViewDebug.IntToString(from = BELOW, to = "below"),
|
|
@ViewDebug.IntToString(from = CENTER_HORIZONTAL, to = "centerHorizontal"),
|
|
@ViewDebug.IntToString(from = CENTER_IN_PARENT, to = "center"),
|
|
@ViewDebug.IntToString(from = CENTER_VERTICAL, to = "centerVertical"),
|
|
@ViewDebug.IntToString(from = LEFT_OF, to = "leftOf"),
|
|
@ViewDebug.IntToString(from = RIGHT_OF, to = "rightOf")
|
|
}, mapping = {
|
|
@ViewDebug.IntToString(from = TRUE, to = "true"),
|
|
@ViewDebug.IntToString(from = 0, to = "false/NO_ID")
|
|
})
|
|
private int[] mRules = new int[VERB_COUNT];
|
|
|
|
private int mLeft, mTop, mRight, mBottom;
|
|
|
|
/**
|
|
* When true, uses the parent as the anchor if the anchor doesn't exist or if
|
|
* the anchor's visibility is GONE.
|
|
*/
|
|
@ViewDebug.ExportedProperty(category = "layout")
|
|
public boolean alignWithParent;
|
|
|
|
public LayoutParams(Context c, AttributeSet attrs) {
|
|
super(c, attrs);
|
|
|
|
TypedArray a = c.obtainStyledAttributes(attrs,
|
|
com.android.internal.R.styleable.RelativeLayout_Layout);
|
|
|
|
final int[] rules = mRules;
|
|
|
|
final int N = a.getIndexCount();
|
|
for (int i = 0; i < N; i++) {
|
|
int attr = a.getIndex(i);
|
|
switch (attr) {
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignWithParentIfMissing:
|
|
alignWithParent = a.getBoolean(attr, false);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_toLeftOf:
|
|
rules[LEFT_OF] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_toRightOf:
|
|
rules[RIGHT_OF] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_above:
|
|
rules[ABOVE] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_below:
|
|
rules[BELOW] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignBaseline:
|
|
rules[ALIGN_BASELINE] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignLeft:
|
|
rules[ALIGN_LEFT] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignTop:
|
|
rules[ALIGN_TOP] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignRight:
|
|
rules[ALIGN_RIGHT] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignBottom:
|
|
rules[ALIGN_BOTTOM] = a.getResourceId(attr, 0);
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentLeft:
|
|
rules[ALIGN_PARENT_LEFT] = a.getBoolean(attr, false) ? TRUE : 0;
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentTop:
|
|
rules[ALIGN_PARENT_TOP] = a.getBoolean(attr, false) ? TRUE : 0;
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentRight:
|
|
rules[ALIGN_PARENT_RIGHT] = a.getBoolean(attr, false) ? TRUE : 0;
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentBottom:
|
|
rules[ALIGN_PARENT_BOTTOM] = a.getBoolean(attr, false) ? TRUE : 0;
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_centerInParent:
|
|
rules[CENTER_IN_PARENT] = a.getBoolean(attr, false) ? TRUE : 0;
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_centerHorizontal:
|
|
rules[CENTER_HORIZONTAL] = a.getBoolean(attr, false) ? TRUE : 0;
|
|
break;
|
|
case com.android.internal.R.styleable.RelativeLayout_Layout_layout_centerVertical:
|
|
rules[CENTER_VERTICAL] = a.getBoolean(attr, false) ? TRUE : 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
a.recycle();
|
|
}
|
|
|
|
public LayoutParams(int w, int h) {
|
|
super(w, h);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public LayoutParams(ViewGroup.LayoutParams source) {
|
|
super(source);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public LayoutParams(ViewGroup.MarginLayoutParams source) {
|
|
super(source);
|
|
}
|
|
|
|
@Override
|
|
public String debug(String output) {
|
|
return output + "ViewGroup.LayoutParams={ width=" + sizeToString(width) +
|
|
", height=" + sizeToString(height) + " }";
|
|
}
|
|
|
|
/**
|
|
* Adds a layout rule to be interpreted by the RelativeLayout. This
|
|
* method should only be used for constraints that don't refer to another sibling
|
|
* (e.g., CENTER_IN_PARENT) or take a boolean value ({@link RelativeLayout#TRUE}
|
|
* for true or - for false). To specify a verb that takes a subject, use
|
|
* {@link #addRule(int, int)} instead.
|
|
*
|
|
* @param verb One of the verbs defined by
|
|
* {@link android.widget.RelativeLayout RelativeLayout}, such as
|
|
* ALIGN_WITH_PARENT_LEFT.
|
|
* @see #addRule(int, int)
|
|
*/
|
|
public void addRule(int verb) {
|
|
mRules[verb] = TRUE;
|
|
}
|
|
|
|
/**
|
|
* Adds a layout rule to be interpreted by the RelativeLayout. Use this for
|
|
* verbs that take a target, such as a sibling (ALIGN_RIGHT) or a boolean
|
|
* value (VISIBLE).
|
|
*
|
|
* @param verb One of the verbs defined by
|
|
* {@link android.widget.RelativeLayout RelativeLayout}, such as
|
|
* ALIGN_WITH_PARENT_LEFT.
|
|
* @param anchor The id of another view to use as an anchor,
|
|
* or a boolean value(represented as {@link RelativeLayout#TRUE})
|
|
* for true or 0 for false). For verbs that don't refer to another sibling
|
|
* (for example, ALIGN_WITH_PARENT_BOTTOM) just use -1.
|
|
* @see #addRule(int)
|
|
*/
|
|
public void addRule(int verb, int anchor) {
|
|
mRules[verb] = anchor;
|
|
}
|
|
|
|
/**
|
|
* Retrieves a complete list of all supported rules, where the index is the rule
|
|
* verb, and the element value is the value specified, or "false" if it was never
|
|
* set.
|
|
*
|
|
* @return the supported rules
|
|
* @see #addRule(int, int)
|
|
*/
|
|
public int[] getRules() {
|
|
return mRules;
|
|
}
|
|
}
|
|
|
|
private static class DependencyGraph {
|
|
/**
|
|
* List of all views in the graph.
|
|
*/
|
|
private ArrayList<Node> mNodes = new ArrayList<Node>();
|
|
|
|
/**
|
|
* List of nodes in the graph. Each node is identified by its
|
|
* view id (see View#getId()).
|
|
*/
|
|
private SparseArray<Node> mKeyNodes = new SparseArray<Node>();
|
|
|
|
/**
|
|
* Temporary data structure used to build the list of roots
|
|
* for this graph.
|
|
*/
|
|
private LinkedList<Node> mRoots = new LinkedList<Node>();
|
|
|
|
/**
|
|
* Clears the graph.
|
|
*/
|
|
void clear() {
|
|
final ArrayList<Node> nodes = mNodes;
|
|
final int count = nodes.size();
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
nodes.get(i).release();
|
|
}
|
|
nodes.clear();
|
|
|
|
mKeyNodes.clear();
|
|
mRoots.clear();
|
|
}
|
|
|
|
/**
|
|
* Adds a view to the graph.
|
|
*
|
|
* @param view The view to be added as a node to the graph.
|
|
*/
|
|
void add(View view) {
|
|
final int id = view.getId();
|
|
final Node node = Node.acquire(view);
|
|
|
|
if (id != View.NO_ID) {
|
|
mKeyNodes.put(id, node);
|
|
}
|
|
|
|
mNodes.add(node);
|
|
}
|
|
|
|
/**
|
|
* Builds a sorted list of views. The sorting order depends on the dependencies
|
|
* between the view. For instance, if view C needs view A to be processed first
|
|
* and view A needs view B to be processed first, the dependency graph
|
|
* is: B -> A -> C. The sorted array will contain views B, A and C in this order.
|
|
*
|
|
* @param sorted The sorted list of views. The length of this array must
|
|
* be equal to getChildCount().
|
|
* @param rules The list of rules to take into account.
|
|
*/
|
|
void getSortedViews(View[] sorted, int... rules) {
|
|
final LinkedList<Node> roots = findRoots(rules);
|
|
int index = 0;
|
|
|
|
while (roots.size() > 0) {
|
|
final Node node = roots.removeFirst();
|
|
final View view = node.view;
|
|
final int key = view.getId();
|
|
|
|
sorted[index++] = view;
|
|
|
|
final HashSet<Node> dependents = node.dependents;
|
|
for (Node dependent : dependents) {
|
|
final SparseArray<Node> dependencies = dependent.dependencies;
|
|
|
|
dependencies.remove(key);
|
|
if (dependencies.size() == 0) {
|
|
roots.add(dependent);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (index < sorted.length) {
|
|
throw new IllegalStateException("Circular dependencies cannot exist"
|
|
+ " in RelativeLayout");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Finds the roots of the graph. A root is a node with no dependency and
|
|
* with [0..n] dependents.
|
|
*
|
|
* @param rulesFilter The list of rules to consider when building the
|
|
* dependencies
|
|
*
|
|
* @return A list of node, each being a root of the graph
|
|
*/
|
|
private LinkedList<Node> findRoots(int[] rulesFilter) {
|
|
final SparseArray<Node> keyNodes = mKeyNodes;
|
|
final ArrayList<Node> nodes = mNodes;
|
|
final int count = nodes.size();
|
|
|
|
// Find roots can be invoked several times, so make sure to clear
|
|
// all dependents and dependencies before running the algorithm
|
|
for (int i = 0; i < count; i++) {
|
|
final Node node = nodes.get(i);
|
|
node.dependents.clear();
|
|
node.dependencies.clear();
|
|
}
|
|
|
|
// Builds up the dependents and dependencies for each node of the graph
|
|
for (int i = 0; i < count; i++) {
|
|
final Node node = nodes.get(i);
|
|
|
|
final LayoutParams layoutParams = (LayoutParams) node.view.getLayoutParams();
|
|
final int[] rules = layoutParams.mRules;
|
|
final int rulesCount = rulesFilter.length;
|
|
|
|
// Look only the the rules passed in parameter, this way we build only the
|
|
// dependencies for a specific set of rules
|
|
for (int j = 0; j < rulesCount; j++) {
|
|
final int rule = rules[rulesFilter[j]];
|
|
if (rule > 0) {
|
|
// The node this node depends on
|
|
final Node dependency = keyNodes.get(rule);
|
|
// Skip unknowns and self dependencies
|
|
if (dependency == null || dependency == node) {
|
|
continue;
|
|
}
|
|
// Add the current node as a dependent
|
|
dependency.dependents.add(node);
|
|
// Add a dependency to the current node
|
|
node.dependencies.put(rule, dependency);
|
|
}
|
|
}
|
|
}
|
|
|
|
final LinkedList<Node> roots = mRoots;
|
|
roots.clear();
|
|
|
|
// Finds all the roots in the graph: all nodes with no dependencies
|
|
for (int i = 0; i < count; i++) {
|
|
final Node node = nodes.get(i);
|
|
if (node.dependencies.size() == 0) roots.add(node);
|
|
}
|
|
|
|
return roots;
|
|
}
|
|
|
|
/**
|
|
* Prints the dependency graph for the specified rules.
|
|
*
|
|
* @param resources The context's resources to print the ids.
|
|
* @param rules The list of rules to take into account.
|
|
*/
|
|
void log(Resources resources, int... rules) {
|
|
final LinkedList<Node> roots = findRoots(rules);
|
|
for (Node node : roots) {
|
|
printNode(resources, node);
|
|
}
|
|
}
|
|
|
|
static void printViewId(Resources resources, View view) {
|
|
if (view.getId() != View.NO_ID) {
|
|
d(LOG_TAG, resources.getResourceEntryName(view.getId()));
|
|
} else {
|
|
d(LOG_TAG, "NO_ID");
|
|
}
|
|
}
|
|
|
|
private static void appendViewId(Resources resources, Node node, StringBuilder buffer) {
|
|
if (node.view.getId() != View.NO_ID) {
|
|
buffer.append(resources.getResourceEntryName(node.view.getId()));
|
|
} else {
|
|
buffer.append("NO_ID");
|
|
}
|
|
}
|
|
|
|
private static void printNode(Resources resources, Node node) {
|
|
if (node.dependents.size() == 0) {
|
|
printViewId(resources, node.view);
|
|
} else {
|
|
for (Node dependent : node.dependents) {
|
|
StringBuilder buffer = new StringBuilder();
|
|
appendViewId(resources, node, buffer);
|
|
printdependents(resources, dependent, buffer);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void printdependents(Resources resources, Node node, StringBuilder buffer) {
|
|
buffer.append(" -> ");
|
|
appendViewId(resources, node, buffer);
|
|
|
|
if (node.dependents.size() == 0) {
|
|
d(LOG_TAG, buffer.toString());
|
|
} else {
|
|
for (Node dependent : node.dependents) {
|
|
StringBuilder subBuffer = new StringBuilder(buffer);
|
|
printdependents(resources, dependent, subBuffer);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A node in the dependency graph. A node is a view, its list of dependencies
|
|
* and its list of dependents.
|
|
*
|
|
* A node with no dependent is considered a root of the graph.
|
|
*/
|
|
static class Node implements Poolable<Node> {
|
|
/**
|
|
* The view representing this node in the layout.
|
|
*/
|
|
View view;
|
|
|
|
/**
|
|
* The list of dependents for this node; a dependent is a node
|
|
* that needs this node to be processed first.
|
|
*/
|
|
final HashSet<Node> dependents = new HashSet<Node>();
|
|
|
|
/**
|
|
* The list of dependencies for this node.
|
|
*/
|
|
final SparseArray<Node> dependencies = new SparseArray<Node>();
|
|
|
|
/*
|
|
* START POOL IMPLEMENTATION
|
|
*/
|
|
// The pool is static, so all nodes instances are shared across
|
|
// activities, that's why we give it a rather high limit
|
|
private static final int POOL_LIMIT = 100;
|
|
private static final Pool<Node> sPool = Pools.synchronizedPool(
|
|
Pools.finitePool(new PoolableManager<Node>() {
|
|
public Node newInstance() {
|
|
return new Node();
|
|
}
|
|
|
|
public void onAcquired(Node element) {
|
|
}
|
|
|
|
public void onReleased(Node element) {
|
|
}
|
|
}, POOL_LIMIT)
|
|
);
|
|
|
|
private Node mNext;
|
|
|
|
public void setNextPoolable(Node element) {
|
|
mNext = element;
|
|
}
|
|
|
|
public Node getNextPoolable() {
|
|
return mNext;
|
|
}
|
|
|
|
static Node acquire(View view) {
|
|
final Node node = sPool.acquire();
|
|
node.view = view;
|
|
|
|
return node;
|
|
}
|
|
|
|
void release() {
|
|
view = null;
|
|
dependents.clear();
|
|
dependencies.clear();
|
|
|
|
sPool.release(this);
|
|
}
|
|
/*
|
|
* END POOL IMPLEMENTATION
|
|
*/
|
|
}
|
|
}
|
|
}
|